| call_external, passing string (in unix) [message #2443] |
Thu, 30 June 1994 06:27 |
stl
Messages: 70
Registered: February 1994
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hello,
I have been learning/testing/playing with call external the last few
days. PAssing strings, numbers, structures to and from some C routines
on my sparc 10 running Sun OS . My question is this:
Is it possible to pass a string by reference, and redefine it
in the shared object library as a longer string? (if so, do you
use the field stype and set it to 1???) I have made numerous
attempts at this, but it seems that you are limitted to the size of
the passed in string (from IDL) or shorter. Even when I 'realloc'
(char *) s IDL dumps core, or get a bus error. (not surprising
really)
I guess i am asking if I have to pass in a large string that is
bigger then my expected data? Also, if you reduce the size of the
string, does anyone have experience of weather this will lead to
large memory fragmentation.
I guess as a side note, I am dreamingly hoping that some version will
someday appear where IDL will allow you to type cast returned variables
from routines called with call external. Anyone ever heasrd of any
plans for this? (or think its a usefull or really stupid idea?)
thanks for the help/insight with the string struff.
-stephen
--
Stephen C Strebel / SKI TO DIE
strebel@sma.ch / and
Swiss Meteorological Institute, Zuerich / LIVE TO TELL ABOUT IT
01 256 93 85 / (and pray for snow)
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